Configuring OSPF Authentication

• Once you have OSPF working, you need to secure it. This is done by using OSPF authentication, using either MD5 hashes or plain-text passwords. In the example below, I am configuring OSPF authentication using plain-text passwords. For each interface on the router that communicates with another router, we need to access that interface, set the auth password, and enable ospf authentication. In the example below, we access the interface, set the password, and enable authentication. secret is the password in this example.